ticking

I have a 2002 Tahoe 5.3 that I bought new. It has 194,000 mile and it ahs been well taken care of. I had just replaced the water pump and took it on a long trip. Drove fine but notice oil pressure up around 65 psi when getting on it. It usually was always 50psi & never moved. Just recently now I...

Today leaving from a nice dinner, I jumped in my 2000 tahoe z71 and heard a tick. Just got the tahoe this passed weekend, so I wasnt sure what to expect. After getting home and inspecting, it is coming from my ac pump. it ticks when the ac is off. the pump wont engage when i turn the a/c on, but...